[asterisk-users] Poor gsm playback

[John Fawcett]

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I've have installed a new Asterisk 1.4.15 system after having previously
used a 1.2 CVS head (from 10 Sep 2005). Both systems are pentiums though
the newer one is actually a slower processor.

On the new system, playback of gsm files is noticeably poorer (voice
quality is flakely) on any connected phone (sip or isdn, internal or
external).

Prompts recorded in sln are very clear quality as are voicemail recorded
in wav. Call quality is also good.

"core show translation" show "gsm=>other format" times are similar to
old system.

what could be the reason for the poor performance of gsm? How could I
investigate it?

Only other things to note are that I am using mISDN and ztdummy (as
before) though last time I had also installed libpri - but never used it
so did not install this time.

thanks
John

new system

       Translation times between formats (in milliseconds) for one
second of data
        Source Format (Rows) Destination Format (Columns)

        g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc
g726 g722
   g723    -   -    -    -        -     -    -     -    -     -
- -    -    -
    gsm    -   -    2    2        2     2    1     5    -     -
19    2    -
   ulaw    -   4    -    1        2     2    1     5    -     -
19    2    -
   alaw    -   4    1    -        2     2    1     5    -     -
19    2    -
g726aal2    -   4    2    2        -     2    1     5    -     -
19    1    -
  adpcm    -   4    2    2        2     -    1     5    -     -
19    2    -
   slin    -   3    1    1        1     1    -     4    -     -
18    1    -
  lpc10    -   5    3    3        3     3    2     -    -     -
20    3    -
   g729    -   -    -    -        -     -    -     -    -     -
- -    -    -
  speex    -   -    -    -        -     -    -     -    -     -
- -    -    -
   ilbc    -   6    4    4        4     4    3     7    -     -
- -    4    -
   g726    -   4    2    2        1     2    1     5    -     -
19    -    -
   g722    -   -    -    -        -     -    -     -    -     -
- -    -    -

old system

      g723   gsm  ulaw  alaw  g726 adpcm  slin lpc10  g729 speex  ilbc
 g723     -     -     -     -     -     -     -     -     -     -     -
  gsm     -     -     2     2     2     2     1     5     -     -    17
 ulaw     -     4     -     1     2     2     1     5     -     -    17
 alaw     -     4     1     -     2     2     1     5     -     -    17
 g726     -     4     2     2     -     2     1     5     -     -    17
adpcm     -     4     2     2     2     -     1     5     -     -    17
 slin     -     3     1     1     1     1     -     4     -     -    16
lpc10     -     5     3     3     3     3     2     -     -     -    18
 g729     -     -     -     -     -     -     -     -     -     -     -
speex     -     -     -     -     -     -     -     -     -     -     -
 ilbc     -     5     3     3     3     3     2     6     -     -






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